diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-07-16 16:26:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-16 19:23:21 -0700 |
| commit | 0bf5f9492389aa8df5c8e38fcb4488802d24504d (patch) | |
| tree | 9c62b75ac595ca7dd1c0e25261c9a1ad08fb69f0 /mm | |
| parent | c633324e311243586675e732249339685e5d6faa (diff) | |
| download | lwn-0bf5f9492389aa8df5c8e38fcb4488802d24504d.tar.gz lwn-0bf5f9492389aa8df5c8e38fcb4488802d24504d.zip | |
mm: fix the MAP_UNINITIALIZED flag
We can't expose UAPI symbols differently based on CONFIG_ symbols, as
userspace won't have them available. Instead always define the flag,
but only respect it based on the config option.
Link: http://lkml.kernel.org/r/20190703122359.18200-2-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/nommu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index eb3e2e558da1..fed1b6e9c89b 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1261,7 +1261,9 @@ unsigned long do_mmap(struct file *file, add_nommu_region(region); /* clear anonymous mappings that don't ask for uninitialized data */ - if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) + if (!vma->vm_file && + (!IS_ENABLED(CONFIG_MMAP_ALLOW_UNINITIALIZED) || + !(flags & MAP_UNINITIALIZED))) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); |